Rock-drill.



G.'H GILMAN.

ROCK DRILL.. APPLICATION FILED JUNE 25.. i910.

Patented July 17, 1917.

mama p eEOEeE H. GILMAN, or CLAEEMONI, NEw HAMPSHIRE, ASSIGNOE, BY. .MESNE AssIGN- MENTS, To SULLIVAN MACHINERY COMPANY, oEBos'roN, MASSACHUSETTS, A

CORPORATION oP MASSACHUSETTS.

ROCK-DRILL.

To all @hom/"it may concern.'

' Be it known that I,-GEORGE H. GILMAN, a

l citizenof the United States, anda resident for removing the dust and cuttings from the representing like parts.

drilled hole.

The invention will be best understood by l reference to the following description'when taken in connection `with the accompanying illustration of -One speclfic embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings:

Figure 1 shows inelevation a rock drill with its attached bit or cutter embodying 25 one' form' of my invention.

1 Fig. 2 isan enlarged view partly in section showing the drill .steel or cutter and its connection to the cleansing fluid supply. Fig. 3' is a sectional elevation on a/still Largerl Scale showing the pump attaclnrfent.

Fig.' 4 is a sectionlin plan on the line in Eig. '3. f

v Fi 5 -is an elevation partly in section showing a drill steel equipped with a modi-f fied form of the invention. y

Fig. 6 is a Sectional elevation on a larger Scale showing the pump attachment to the drill steel in Fig. 5. f f Fig; Z isl a sectional plan on the line 7-7 jarige.

Referring to the drawings and to the embodiment of my invention shown'A in, Figs.

1-4 inclusive thereof, I have shown the Same applied to a rock drilll of a conventional type. v tion of my inventlon that the latter is independent of-'and apart from the speciic construction of drilling engine employed and that the same may be applied with slight modification or with no change at all to rock drills or other cutting tools of a great `variety of constructions.

The drill 1 is shown as equipped with the It will be obvious from the. descrip- -lPatente'd dulryll, 491W Application led June 25, 1910.l Serial No. 568,802.

drill steel or cutter 2 having the cutting edges 3 of usual shape, the steel, as usual,

being reciprocated and at the same time the bottom of the drilled hole, Ioausel the introduction of a quantity of water or other suitable cleansing liuid into the drilled hole and forcibly eject the Same together with the dust and cuttings by means of a pumpgiven aslight rotative'movement by the Y post-office address ing action produced by the'movement of the drill `steel itself. l I

y To this end I provide the` latter with a suitable .formation or attachment which serves as a pump pistond'adapted to work or move within the drilled hole, thelatter constituting in effect the pump cylinder. Ordinarily the piston can work with' reasonable clearance indirect contact with or proximity to the walls of the drill hole and such a construction isherein Shown.

Various formations :or attachments may be utilized to provide `the piston. member for the cutter, but herein the same consists ofthe perforatedvplate 4 threaded upon the end of the sleeve 5, the vlatter seated against a shoulder ,6 formed between the/shank of the cutter and the upper ends of the cutting edges. The plate or piston head`44 has a ldiameter slightly less than that of the drilled hole and is provided' with one or more perforations 7 (herein eightin number) which are normally closed by the lower ianged edge of the spool valve 9. Whenlthe drill steel is lifted, however, and then forced down, the valve will lift and allow the 'fluid in the lhole'below the piston 4 to pass up through-the perforations to the top ofthe piston, where it is lifted on the next upward movement of ythe steel. The sleeve 5 has a flanged head 10 which limits the upward movement of the'valve and retains it on the sleeve. sleeve is longitudinally split at one or more places and the thread is tapered so that it may be screwed downinto the piston mem-y.

ber 4 and thereby caused to grip forcibly against the sides of the drill steel.

It will be seen that this constitutes in efecta" lift pump Operated by the drillsteel rIhe lower threaded end of the and that this pump forcibly draws the fluid with the accumulated dust and cuttings from the bottom of the hole and from around the cutting edges of the steel up to a point above the piston where it is ejected over the edges of the opening of the drilled hole.

vtion of its length with the axial, longitudinal, fluid-supply passage 11 which extends to the cutting edge of the steel -and is adapted to carry the cleansing fluid under a suitable head from an appropriate source of supply to the bottom of the drilled hole.

Any suitable means may be adopted for introducing the fluid into this supply passage, but herein the steel is provided with a sleeve ory bushing 12 clamped thereto, such bushing having a lateral opening 13 placed in registration with the lateral opening 14 which is formed in the drill steel and communicates `with the feed passage 11. The lateral passage 13, in turn, is placed in communication with a supply pipe 15, the latter connected to any suitable source of fluid supply and being preferably flexible for a portion of its length, so as to permit the required reciprocation of the drill steel.

If desired, however, the fluid may be introduced through the rifle rod and the piston of the drilling engine itself, or any other desired method of feeding the fluid to the steel may be adopted.

With the described construction of-drillsteel pump, the fluid is introduced` near the center of the holewhere it is most effective for washing cuttings toward the sides thereof whence they are carried up along the sides of the drilled hole to the pump piston, thence being lifted by the pump piston to a point ,above the latter, and finally vejected from the top of the hole. This circulation of the fluid, to wit, radially outward toward the sides of the hole, is highly effective in that the -waste material is removed to the point of greatest clearance and where it interferes least with the action of the cutter, and thence, after passage through the valve, to the ample annular clearance space above the pump piston where its further apassa-ge is quite unobstructed. The valve openings 7, being arranged nearthe outer periphery of the pump piston, can be made large and numerous enough to permit the free passage of the fluid and the cuttings on the down stroke of the drill steel so that the resistance to the downward pumping action is inconsiderable.

In Figs. 5, 6 and 7 I have shown a modified form of my invention which may be utilized in connection with a drill steel 16 of cruciform cross section, or any other form of drill steel which it is not desired to perforate, or where an interior fluid supply passage cannot be conveniently provided. In this construction the piston head 4 and the pump 9 may be provided as before, but the sleeve 5 is prolonged so as to lprovide the cylindrical inclosing shell 17 extending to a point well above the top of the drilled hole and providing a fluid supply passage space between the inner walls of the shell and the sides of the drill steel. The upper part of this supply space has connection to the principal fluid supply pipe 15 so that the fluid passes down through the interior of the shell 17 and is discharged at the bottom of the drilled hole i sive deviations and modifications may be made in the described formwithout departing from the spirit thereof.

Claims:

1. The combination with a reciprocatory drilling engine of a percussive cutter for drilling holes, means for introducing cleansing fluid into the hole, and pumping means apart from said drilling engine and attached to the outside of the cutter for circulating cleansing fluid through the drilled hole,,the outflow being at the sides of the hole Vand the path of the inflow within the path of the outflow.

2. The combination with a drilling engine of a percussive cutter, and a valved piston member secured to the cutter and working within the drilled hole, said pis- .ton with the drilling engine constituting a pump and the walls of the hole serving as the pump cylinder.

3. The combination with a drilling engine, of a cutter, a pump lpiston carried by the cutter and having an aperture therethrough, means for controlling the flow through said aperture, and a fluid supply .passage for supplying fluid to the drilled hole passing through said pump piston.

l4. The combination with a drilling engine, of a cutter, a fluid supply conduit for the drilled hole, and pumping means distinct from the engine and carried b the cutter, said pumping means including a valve operating to cause the'discharge of the cleansing fluid upwardly about the outsideof said conduit.

the reciprocationl of said cutter.y

v passage for supplying l5 gine of 6. rll`he combination with a reciprocatory drill of a percussive cutting tool, a rigid connection between `the tool and the drill,

said connection and tool having an interior water supply passage throughwhich water may be supplied to the cutting vedge of the tool, a piston member. encircling and attached to the cutter, and a rearwardly opening valve in the piston member whereby the water introduced at the cutting edge of the tool may be exp'elledmradially outward and then upward with the cuttings at th sides of the drilled hole. 4 .v

7 The combination with a reciprocatory drill of a percussive cutting Vtool, a` rigid -connection between the tool and the drill,

said connection and tool having an interior water supply passage througnwhich water may be supplied to the cutting edge of the tool, a piston member encircling and attached to the cutter and approximately fitting the drilled hole, and a rearwardly opening valve-inl the piston member whereby the water introduced at the cutting edge of the tool may be expelled radially outward and then upward with the cuttings 'at the sides of the drilled hole.

8. The combination with a drilling ena cutter comprising a shank and a cutting head, a pump piston .carried by said shank and having va' rearwardly opening aperture therethrough, automatically acting valve mechanism through said aperture,

fluid to the drilled hole passing through said piston.

9. Thel combination with a drilling engine, of a cutter, a pump piston carried by the cutter and having a 'rearwardly i opencontrolling the flow and a water supply` ing aperture therein, a water supply pas sage for supplying luid to the drilled hole passing through said piston, and a valvev for said aperture reciprocable relative to said cutter.

10. The combination with a drilling engine, of'a cutter, a pump piston carried by the cutter and having a rearwardly opening aperture therein, a sleeve carried by the cutter, a valve for said aperture reciprocable on said sleeve, and a fluid supply passage for supplying fluid to the drilled hole vpassing through said pump piston.

`11. Thel combination with a drilling engine, of a reciprocable cutter, a pump piston thereon having a series of rearwardly opening apertures therethrough, said pis ton being of substantially the diameter of the drilled hole, and a single valve for said apertures controlled by the reciprocation of said cutter.

12. The combination with a drilling engine, fhaving a series of rearwardly opening apertures therein, said pistonbeing of substantially the diameter of the drilled hole, a valve for said apertures reciprocable rela- .tive` to said cutter, and a sleeve carried by said cutter and disposed between the latter and said valve and piston.

13. The combination with a drilling engine, of a cutter having a shoulder-thereon,

. a pump piston carried by said cutter, hav-- ing a rearwardly opening aperture therein, a sleeve carried on said cutter and having a flange thereon, a valve for. said aperture reciprocable between said pist/on and the flange on said sleeve, and a fluid'passage for supplying Huid to the drilled hole passing through said pump plston.

Intestimony whereof, I have slgned my name to this specification, in the presence of two subscribing witnesses.

y GEORGE H. GILMAN.

` "Witnesses:`

E. J. BOUCHARD,

C. J. JONES.

of a cutter, a pump piston thereon 

